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  <script>
    function ara(deck) {
      let map = new Map()
      for (let n of deck) {//统计频次
        map.set(n, map.has(n) ? map.get(n) + 1 : 1)
      }
      let arr = [...map.values()]
      let res = arr[0]
      return arr.every(i => (res = gcd(res, i)) > 1)//求最大公约数是否大于1

    };
    //辗转相除法 4,2
    let gcd = (a, b) => (b === 0 ? a : gcd(b, a % b))
    console.log(ara([1, 2, 3, 4, 4, 3, 2, 1]));
  </script>
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